In an experimental study,men with erectile disorder received either Viagra or a placebo.In this study,the drug dosage (none versus peak dose)was the

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The drug dosage (none versus peak dose) is the independent variable, as it is being manipulated by the researchers to see its effect on erectile disorder. The dependent variable would be the effectiveness of the treatment, as measured by improvements in erectile function. A confounding variable would be something that could affect the results, such as age or overall health status of the participants, but this is not mentioned in the question. A random sample refers to the process of selecting participants for the study, but this is also not relevant to the identification of variables in this scenario.

In an Experimental Study,men with Erectile Disorder Received Either Viagra